Discussion
Assertion (A): A re-entrant corner in a section under torsion is usually filleted.
Reason (R): The membrane must fold sharply into such a corner, giving a very steep slope.
Select the correct answer from the options below.
Answer: D
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason is the analogy applied. Shear stress corresponds to the slope of the soap film, and at a sharp re-entrant corner the film must fold into the angle, giving a locally very steep slope and hence a high stress. A fillet lets the film curve gently instead, which is why filleting is the standard remedy.
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